linux-kernel - Re: [RFC][PATCH] signals: don't copy siginfo

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20090226202711.GB23446@elte.hu>
Date:	Thu, 26 Feb 2009 21:27:11 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Vegard Nossum <vegard.nossum@...il.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] signals: don't copy siginfo_t on dequeue


* Oleg Nesterov <oleg@...hat.com> wrote:

> On 02/26, Vegard Nossum wrote:
> >
> > 2009/2/26 Ingo Molnar <mingo@...e.hu>:
> > >
> > > I.e. shouldnt we have seen a speedup, due to not having to copy
> > > the siginfo structure?
> 
> I am puzzled by these numbers too. I can't understand how this 
> patch can make any difference.

Measurement noise perhaps. Especially such microbenchmarks can 
be very sensitive to cache layout, etc.

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/